HTS40
HTS40 is a Toho Tenax (Teijin) high-tenacity, standard-modulus PAN carbon fiber in the same class as T700, supplied as F13-sized 12K and 24K rovings, E13-sized 3K and 6K tow, and UD epoxy prepreg at 60 % fiber volume.
Reference datasheet — HTS40 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the F13-12K condition
HTS40 grades and fills
HTS40 is supplied in 5 conditions, soft to hard. F13-12K is the default FabDigit quotes; the values on this page are for it.
Compare all 5 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
HTS40 / epoxy UD laminate, Vf ≈ 60% | Reference these cured 0° unidirectional laminate values at Vf ≈ 60 % directly in structural design: 2400 MPa, 142 GPa and Tg 130 °C, with epoxy limiting service to 110 °C. | 2,400 | 1.6 | ||
F13-12KDefault HTS40 F13 12K | Use the 800 tex 12K tow with F13 epoxy-compatible sizing as the general industrial grade for winding, pultrusion, weaving and prepreg at 4300 MPa and 240 GPa. | 4,300 | 1.8 | ||
HTS40 F13 24K | Choose the 1600 tex 24K heavy tow for lower cost and higher deposition rates in winding, pultrusion and heavy fabrics; the coarser tow limits thin-ply and fine-weave work. | 4,300 | 1.8 | ||
HTS40 E13 3K | Pick the 200 tex 3K tow with E13 epoxy sizing for fine plain and twill fabrics, cosmetic surfaces and thin-wall laminates, accepting more tows per width and slower lay-up. | 4,300 | 1.8 | ||
HTS40 E13 6K | Use the 400 tex 6K tow with E13 epoxy sizing as the intermediate fabric and prepreg option, balancing surface appearance against draping and lay-up efficiency. | 4,300 | 1.8 |
What is HTS40?
HTS40 is a Toho Tenax (Teijin) high-tenacity, standard-modulus PAN carbon fiber in the same class as T700, supplied as F13-sized 12K and 24K rovings, E13-sized 3K and 6K tow, and UD epoxy prepreg at 60 % fiber volume. Engineers select it where 4300 MPa tensile strength, 240 GPa modulus and 1.8 % elongation at 1.77 g/cm3 are needed at industrial cost and volume, in winding, pultrusion, RTM, braided and prepreg forms. Limits come from the matrix: no welding, epoxy-limited service temperature, resin UV degradation and galvanic attack on aluminum fittings. CCF700 or T700S are direct substitutes. HTS40 has a density of 1.77 g/cm³ (0.0639 lb/in³), heavier than 51% of composite grades. HTS40 has a tensile strength of 4,300 MPa (624 ksi), stronger than 91% of composite grades. Elongation at break is 1.8% and the elastic modulus is 240 GPa (34.8 Msi).
What is HTS40 used for?
- automotive structural parts
- wind energy
- sporting goods
- industrial tooling
Advantages
- Good corrosion resistance — 92/100, better than 94% of composite grades
- Stiff — 240 GPa (34.8 Msi), better than 85% of composite grades
- Good UV / weathering resistance — 95/100, better than 78% of composite grades
Limitations
- Difficult to machine — 20/100, worse than 77% of composite grades
HTS40 properties
Typical room-temperature values for HTS40-F13-12K; bars are the position among composite grades.
Physical1
HTS40 has a density of 1.77 g/cm³ (0.0639 lb/in³), heavier than 51% of composite grades.
Mechanical8
HTS40 has a tensile strength of 4,300 MPa (624 ksi), stronger than 91% of composite grades. Elongation at break is 1.8% and the elastic modulus is 240 GPa (34.8 Msi).
Thermal5
HTS40 is rated for continuous service to 350°C (662 °F). It conducts heat at 10 W/m·K (5.78 BTU/hr·ft·°F), better than 72% of composite grades. Thermal expansion is -0.1 µm/m·K (-0.0556 µin/in·°F).
Electrical1
HTS40 has an electrical resistivity of 1.6×10⁻⁵ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 94% of composite grades. UV resistance is excellent.
Sustainability4
Producing a kilogram of HTS40 takes about 340 MJ of energy and emits 24 kg of CO₂ — more than 74% of composite grades. Typical recycled content is 0%.
Manufacturability1
HTS40's machinability is poor (20/100, worse than 77% of composite grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the composite family
Yield strength against density for every composite grade FabDigit runs. HTS40 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with HTS40
Is HTS40 easy to machine?
After cure, use PCD or diamond-coated tooling and diamond wheels at high speed and small feed with dust extraction to avoid delamination and burrs. The dust is conductive, so guard against short circuits and use spark-safe collection.
Can HTS40 be welded?
Not weldable; join by adhesive bonding or mechanical fasteners. Use titanium or stainless fasteners with an isolating layer to prevent galvanic corrosion.
Can HTS40 be formed, bent or molded?
Suits wet and dry filament winding, pultrusion, RTM, braiding and autoclave-cured prepreg. F13 and E13 sizings wet out well in epoxy; thermoplastic matrices require a matrix-specific sizing.
HTS40 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Nresidual nitrogen | 2 – 5 | 3.5 |
| epoxy sizingF13/E13 sizing content | 1 – 1.6 | 1.3 |
| Ccarbonization product of PAN precursor | ≥ 93 (balance) |
What surface finishes work on HTS40?
Weave texture is normally covered with a topcoat or gel coat. Sand wet to control dust, and add a UV-blocking coating on exposed parts to protect the resin rather than the fiber.
How much does HTS40 cost?
HTS40 is a high-cost composite ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
HTS40 — frequently asked
What is HTS40 used for?
HTS40 is typically used for automotive structural parts, wind energy, sporting goods and industrial tooling. In short: T700-class high tenacity; industrial-volume standard modulus; wide sizing and tow range.
What is the tensile strength of HTS40?
HTS40 has a typical tensile strength of 4,300 MPa (624 ksi) — stronger than 91% of composite grades. Strength varies by condition: see the 5 listed tempers.
Is HTS40 easy to machine?
Not especially — machinability is rated poor (20/100, worse than 77% of composite grades). After cure, use PCD or diamond-coated tooling and diamond wheels at high speed and small feed with dust extraction to avoid delamination and burrs. The dust is conductive, so guard against short circuits and use spark-safe collection.
Can HTS40 be welded?
Not weldable; join by adhesive bonding or mechanical fasteners. Use titanium or stainless fasteners with an isolating layer to prevent galvanic corrosion.
What surface finishes work on HTS40?
Weave texture is normally covered with a topcoat or gel coat. Sand wet to control dust, and add a UV-blocking coating on exposed parts to protect the resin rather than the fiber.
Can HTS40 be formed, bent or molded?
Suits wet and dry filament winding, pultrusion, RTM, braiding and autoclave-cured prepreg. F13 and E13 sizings wet out well in epoxy; thermoplastic matrices require a matrix-specific sizing.
What is the maximum service temperature of HTS40?
HTS40 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does HTS40 cost?
HTS40 is a high-cost composite ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- Tenax-E HTS40 filament yarn datasheet — Teijin Carbon (Toho Tenax) (2022)
- ASM Engineered Materials Handbook Vol.1: Composites — ASM International (1987)
- MMPDS/CMH-17 typical carbon/epoxy UD lamina data — CMH-17 (2017)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.